How about apple airtags? They get picked up by other iDevices and then when one of those strays into range of the internet reports it's last known position. Surely any thieves will want to at some point have use of their acquired goods or sell them on or whatever and they will want to use their phones at some point... I mean, you do not want to look at what coverage your asset gets, you want to look at the coverage your potential thief gets and this way, you are pretty much (drumroll please) covered! :P
Cheers,
-P

